I am not sure that I will be able to help but, I will try.
The issues that you are having are very strange because one of the nicer things that the Nautilus offers is the fact that it is sealed at the connector. No leaking is possible there.
You must be getting way too much
juice to the wick and coil for some reason. Did you try using the largest air hole? The smaller the air hole, the more juice that gets to the coil. The larger the air hole, the less juice that gets to the coil. You may also want to try
vaping it at higher voltage/wattage.
The only other possibility that I am able to think of is maybe you have a defective Nautilus? Maybe you have a defective coil? Have you tried a different coil?
Sorry that I am not able to be of more help but, I have had zero issues with mine in the months that I have been using it. I love my Nautilus and I sure hope that you are able to get yours figured out so that you may enjoy yours as well.
Good luck!